﻿//*********************************************************
//
// Copyright (c) Microsoft. All rights reserved.
// THIS CODE IS PROVIDED *AS IS* WITHOUT WARRANTY OF
// ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING ANY
// IMPLIED WARRANTIES OF FITNESS FOR A PARTICULAR
// PURPOSE, MERCHANTABILITY, OR NON-INFRINGEMENT.
//
//*********************************************************
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using Windows.ApplicationModel;
using Windows.ApplicationModel.Activation;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;
using Expenses.Views;
using Expenses.ViewModels;
using Expenses.ExpenseService;
using Expenses.Common;
using Windows.System.UserProfile;
using Windows.Networking.Connectivity;
using System.Collections.ObjectModel;
using Windows.UI.ApplicationSettings;
using Callisto.Controls;
using Windows.UI;

namespace Expenses
{
    /// <summary>
    /// Provides application-specific behavior to supplement the default Application class.
    /// </summary>
    sealed partial class App : Application
    {
        public static Employee Employee;
        public static int EmployeeId = 0;
        public static bool IsManager;
        public static string UserName;
        public static List<ChargeViewModel> SelectedCharges;
        public static string LastPage;
        public static ExpenseReportViewModel CurrentExpenseReport;
        public static ObservableCollection<ExpenseItemViewModel> CurrentExpenseItems;
        public static bool DomainUser;

        /// <summary>
        /// Initializes the singleton application object.  This is the first line of authored code
        /// executed, and as such is the logical equivalent of main() or WinMain().
        /// </summary>
        public App()
        {
            this.InitializeComponent();
            this.Suspending += OnSuspending;
        }

        /// <summary>
        /// Invoked when the application is launched normally by the end user.  Other entry points
        /// will be used when the application is launched to open a specific file, to display
        /// search results, and so forth.
        /// </summary>
        /// <param name="args">Details about the launch request and process.</param>
        protected override async void OnLaunched(LaunchActivatedEventArgs args)
        {
            // Do not repeat app initialization when already running, just ensure that
            // the window is active
            if (args.PreviousExecutionState == ApplicationExecutionState.Running)
            {
                Window.Current.Activate();
                return;
            }

            if (args.PreviousExecutionState == ApplicationExecutionState.Terminated)
            {
                //TODO: Load state from previously suspended application
            }

            var rootFrame = new Frame();

            // Get the employee
            var employeeViewModel = new EmployeeViewModel();
            try
            {
                UserName = await UserInformation.GetDisplayNameAsync();
                Employee = await employeeViewModel.GetEmployee();
                EmployeeId = Employee.EmployeeId;

                // Create a Frame to act navigation context and navigate to the first page
                if (String.IsNullOrEmpty(args.Arguments))
                {
                    if (!rootFrame.Navigate(typeof(MainPage)))
                    {
                        throw new Exception("Failed to create initial page");
                    }
                }
                else
                {
                    int reportNumber = Convert.ToInt32(args.Arguments.Substring(
                        args.Arguments.LastIndexOf(":") + 1));
                    var expenseReportViewModel = new ExpenseReportViewModel();
                    CurrentExpenseReport = 
                        await expenseReportViewModel.GetExpenseReport(reportNumber);

                    if (!rootFrame.Navigate(typeof(ExpenseReportPage)))
                    {
                        throw new Exception("Failed to create initial page");
                    }
                }
            }
            catch (Exception ex)
            {
                if (!rootFrame.Navigate(typeof(ErrorPage)))
                {
                    throw new Exception("Failed to create initial page");
                }
            }

            // Place the frame in the current Window and ensure that it is active
            Window.Current.Content = rootFrame;
            Window.Current.Activate();


            // Register handler for CommandsRequested events from the settings pane
            SettingsPane.GetForCurrentView().CommandsRequested += OnCommandsRequested;
        }

        void OnCommandsRequested(SettingsPane sender, 
            SettingsPaneCommandsRequestedEventArgs args)
        {
            // Add a Change user command
            var changeUserCommand = new SettingsCommand("change", "Change user", (handler) =>
            {
                var settings = new SettingsFlyout();
                settings.Content = new ChangeUserUserControl();
                settings.HeaderBrush = new SolidColorBrush(Color.FromArgb(255, 44, 111, 207));
                settings.Background = new SolidColorBrush(Color.FromArgb(255, 245, 245, 239));
                settings.HeaderText = "Change user";
                settings.IsOpen = true;
            });
            args.Request.ApplicationCommands.Add(changeUserCommand);

            // Add a Reset data command
            var resetDataCommand = new SettingsCommand("reset", "Reset data", (handler) =>
            {
                var settings = new SettingsFlyout();
                settings.Content = new ResetDataUserControl();
                settings.HeaderBrush = new SolidColorBrush(Color.FromArgb(255, 44, 111, 207));
                settings.Background = new SolidColorBrush(Color.FromArgb(255, 245, 245, 239));
                settings.HeaderText = "Reset data";
                settings.IsOpen = true;
            });
            args.Request.ApplicationCommands.Add(resetDataCommand);

            // Add an About command
            var aboutCommand = new SettingsCommand("about", "About", (handler) =>
            {
                var settings = new SettingsFlyout();
                settings.Content = new AboutUserControl();
                settings.HeaderBrush = new SolidColorBrush(Color.FromArgb(255, 44, 111, 207));
                settings.Background = new SolidColorBrush(Color.FromArgb(255, 245, 245, 239));
                settings.HeaderText = "About";
                settings.IsOpen = true;
            });
            args.Request.ApplicationCommands.Add(aboutCommand);
        }
        
        /// <summary>
        /// Invoked when application execution is being suspended.  Application state is saved
        /// without knowing whether the application will be terminated or resumed with the contents
        /// of memory still intact.
        /// </summary>
        /// <param name="sender">The source of the suspend request.</param>
        /// <param name="e">Details about the suspend request.</param>
        private async void OnSuspending(object sender, SuspendingEventArgs e)
        {
            var deferral = e.SuspendingOperation.GetDeferral();
            await SuspensionManager.SaveAsync();
            deferral.Complete();
        }
    }
}
